Perpetual calendar



May 18,1926. 1,585,470

4 L. B. DES NOS PERPETUAL CALENDAR Filed Oct. 12, 1925' /Z F/ k \l y lvtveizr "47 @M@ 444 ditr Patented May 18, 1926.

UNITE STTr LOUIE BRISSE'I DES NOS, OF MEDIEIELD, MASSACHUSETTS.

PERPETUAL CALENDAR.

Application filed October 12, 1925.

have heretofore been devised many devices,

6 known as perpetual calendars, chronological charts, or the like, but all of these, so far as I am aware, have had for their object the achievement of but one result. For example, such a chart may have been utilized to ascertain on what day of the week a certain date of the month would fall, or the like, but my device, I believe, is the first of its kind which contains sufficiently complete data to be of practical and even scientific application. These previous charts and calendars also, have been composed of a plurality of parts, more or less complex in manufacture, and difiicult of operation.

A principal feature of my present invention, therefore, is the construction of a simple perpetual calendar, with a minimum of operating or movable parts, one which will be extremely economical to manufacture, easy to operate, and readily understandable.

A further feature of my present invention is that any question concerning days or dates, within reason, can be answered by utilizing my present device. For example, it is possible by the use of my novel perpetual calendar to ascertain on what day of the week a certain date of a certain month would fall. It is also readily ascertainable in' what years of a given century a certain date will fall, for example on Thursday. It can also be ascertained on what dates in a month of a given year a day will fall. Other uses and applications of my novel calendar will doubtless readily occur to those to whom this invention may come.

My present invention comprises a disc provided with a plurality of concentric rings. The disc is also sub-divided into sectors by seven radii, and the dates of the month, the months, the centuries, and the years are contained between the concentric rings, from the inner ring outwardly. In the circle formed by the inner ring are the days of the week. It will be noted that the days of the week are in sequence, but that the other notations, the years, centuries, months and days of the month, are not arranged in sequence, but have been subdivided in the seven sectors, in the best possible arrangement to facilitate easy operation of the calendar.

Further features of the invention, with de tails of construction and advantages, will be Serial No. 61,971.

hereinafter more fully pointed out and claimed.

Referring to the drawings,

Fig. 1 is a top plan view of my novel calendar with the indicating disc partly broken away;

Fig. 2 is a cross sectional view of the same.

As shown in the drawings, my invention comprises a main disc 1, and an indicating disc 2, pivotally attached by means of a rivet 3 or the like. The disc 1 is divided into seven sectors, 1, 5, 6, 7, 8, 9, and 10, and is provided with a plurality-of concentric rings 11, 12, 13, and 14:. Since'it is desirable to use one of the sectors as a basis for operations, I have provided the sector 4: with an extension 15, to indicate that this is the starting or finishing point for calculations. On the outer periphery of the disc, beyond the ring 11 are the years, from the year 1 to the year 99, arranged in seven groups, for greatest facility. Between the rings 11 and 12 appear the centuries, or the hundred year indications. Between the rings 12 and 13 are the months, and between the rings 13 and 14 are the days of the month from one to thirty-one. It will thus be apparent that my calendar covers a range from January 1st of the year 1 to December 31st, 2999. For calculations involving the leap years, the months of January and February-have been repeated, and moved one sectorto the left of normal position for January and February. These leap year months, or those affected by the coming of a leap year, have been underscored. Also, leap years themselves have been underscored, so that the operator will instantly known whether or not a year in which he is calculating, is a leap year. The indicating disc 2 is also divided into seven sectors, 16, 17, 18, 19, 20, 21, and 22. I have herein illustrated these sectors as designated by an arrow, and the numerals 2 to 7, but any indications or marks may be used thereon, or the same may be identified or designated by varying colors. In one of the sectors of the indicating disc I provide an aperture 23, of a size'sutficient to show one of the days of the week thereunder.

As explained above, my novel perpetual calendar may be utilized for various calculations, involving at the most four movements of the indicating disc. It is eflicient and positive in its operation, as I have checked and proved carefully the various results arrived at by the use of same.

The operation of my novel calendar will now be described.

Assuming it to be desired to ascertain on what day the 3d of October, 1925, would fall, the sector 16, with the indicating arrow would be rotated to the sector 7, wherein is contained the numeral 3, for the day of the month. Then operating from the sector 4, containing the indicating extension 5, the sector 19 is now in cooperation with the sector 4, but need not be moved because it is on the month of October. Then I move the sector 19 to cooperate with the sector 6, wherein is contained the 1900 year mark, and then move the sector 21 from its position in line with the sector 4% to the sector 5, which contains the year 25, whereupon the aperture 23 is in alinement with Saturday, thus proving that the 3d of October, 1925, falls on a Saturday.

Or assuming it to be desired to ascertain in what years of a certain century a. given day (say Thursday) would fall on the 1st of October. To work out this calculation, the aperture 23 would be placed over Thursday, then the sector in line with the sector 5 con taining the 1st day oi the month would be moved to the sector 4c; the second movement of the indicating disc 2 may be eliminated on this calculation because October is in the sector 4. Then the sctor on the indicating disc in line with the sector 6, containing the 1900 year, is moved to the sector 4:, and the arrow or other indication in the sector 16, will designate the sector 5 illustrating that Thursday falls on the 1st of October in the 20th century on the years contained beyond the outer ring, viz, 1903, 1908, 1914., 1925, et a1.

Or assuming it to be desired to ascertain on what dates of a certain month of a given year Wednesday will fall (say September, 1925), the aperture 23 is placed over Nednesday. Then the sector 21 is moved to aline with the sector 4. Then the sector 19 is moved to the sector 4 after which the sector 18, indicating the year 25 is moved to cooperate with the sector t, whereupon the arrow or sector 16 of the disc 2 is in alinement with the sector 6, illustrating that Vednesday in September 1925 falls on the 2d, 9th, 16th, 23d and 30th.

It will thus be apparent that a person can derive a. great deal of benefit from this simply operated device, and that the use of the same will cover a wide field. Questions are continually beingasked as to what day a certain date fell on, or in what years a certain date will come on a given day, or what dates of the month of a certain year a given day will fall on, and my novel calendar will answer all of these questions. It may be used at parties, for games, wherein its function as a calendular question box would be fulfilled.

I believe that my novel calendar comprising as it does a single disc to contain the days of the week, days of the month, months, centuries, and years, all arranged in irregular or unsequential order, for ease of operation, and a single small indicating disc, is new, and I desire to claim the same herein.

My invention is further described and defined in the form of claim as follows A perpetual calendar of the kind described, comprising a disc having thereon a plurality of concentric circular spaces, containing respectively the years, the centuries, the months, and the days of the month, an inner circle containing the days of the week, a rotatable disc mounted on said first disc and adapted to cover only the said circle containing the days of the week, sectors on said first disc, sectors on said rotatable disc to cooperate with said first sectors, said rotatable disc having an aperture therein, an indicating portion on one of the sectors on said fi/rst disc, said rotatable disc being adapted to be manipulated to disclose calendular facts and data.

In testimony whereof, I have signed my name to this specification.

LOUIS BBISSET DES NOS. 

